2019 RETA Breeze Sept-Oct

facility must DOCUMENT this chosen standard, TRAIN affected personnel, including contractors, and DOCUMENT this training, including proof of understanding. For instance, perhaps a facility, after considering the relative hazards of the ammonia refrigeration piping, and documenting those considerations in their PHA, develops a standard as follows: Ammonia Refrigeration Pipe Labeling: Internal Standard – J&D Jammin’ BBQ, LLC The following standards shall apply to the ammonia refrigeration pipe labels at all J&D Jammin’ BBQ, LLC, facilities. 1. Ammonia refrigeration pipe labeling shall comply with IIAR2-2008, and shall contain the following information: a. Physical state identified by the following background colors: 1. Note that in addition to the pressure text, high pressure lines will be denoted by a red directional arrow ii. Low: below 70 psig c. Direction of flow arrow 2. In addition, the following will be included on the labeling a. Chemical identification denoted by NH3 3. Pipe labeling must be placed 2 feet of any direction change or roof/wall penetration. Label spacing on horizontal or vertical runs must be such that a label is visible from any point along the pipe 4. The label must be viewable from the primary point of view, but additional labels may be added around the circumference of the pipe if it is deemed necessary through a process hazard analysis 5. Pipe labeling text must be sized so that the text is viewable from the primary viewpoint, or within 25 feet of the pipe, whichever is further This internal standard not only describes an identification method that would be compliant with IIAR2-2008, but also includes parameters that cover the hazards addressed through ASME A13.1. The following are examples of compliant labels under this internal standard. i. Orange – liquid refrigerant ii. Yellow – refrigerant vapor iii. Purple – two phase (vapor/liquid) refrigerant b. The relative pressure denoted by: i. High: 70 psig and above

Wet Suction

Dry Suction

High Pressure Liquid / High Temperature Recirc. Liquid

Hot Gas Defrost

Selecting Recognized and Generally Accepted Good Engineering Practices for ammonia refrigeration piping is critical for a facility. Without pipe labeling standards, employees and contractors are at risk of injury or even death. The key to selecting your RAGAGEP for pipe labeling is three fold. 1. Make sure that ALL potential risks have been addressed through the selected RAGAGEP. If they have not, then additional RAGAGEP must be selected, or even developed. 2. Make sure that all affected personnel are trained on the identification schemes defined by the selected RAGAGEP. 3. Document this training and be sure to include proof of understanding. Next month, we will review IIAR Bulletin 114 as a RAGAGEP, and describe some of the changes in it over the years. Bill Lape is Project Director for SCS Engineers. Bill is a Certified Industrial Refrigeration Operator, a Certified Refrigeration Service Technician, and a member of the National Board of Directors of the Refrigerating Engineers and Technicians Association.

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